1315606661550 has 240 divisors, whose sum is σ = 4003933530960. Its totient is φ = 318805079040.

The previous prime is 1315606661543. The next prime is 1315606661557. The reversal of 1315606661550 is 551666065131.

It is an interprime number because it is at equal distance from previous prime (1315606661543) and next prime (1315606661557).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 1315606661496 and 1315606661505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1315606661557) by changing a digit.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 1667197 + ... + 2326103.

It is an arithmetic number, because the mean of its divisors is an integer number (16683056379).

Almost surely, 2^{1315606661550} is an apocalyptic number.

1315606661550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1315606661550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2001966765480).

1315606661550 is an abundant number, since it is smaller than the sum of its proper divisors (2688326869410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1315606661550 is a wasteful number, since it uses less digits than its factorization.

1315606661550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658977 (or 658963 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 45.

The spelling of 1315606661550 in words is "one trillion, three hundred fifteen billion, six hundred six million, six hundred sixty-one thousand, five hundred fifty".