61318061501550 has 96 divisors (see below), whose sum is σ = 175387336396800. Its totient is φ = 13886973797760.

The previous prime is 61318061501533. The next prime is 61318061501573. The reversal of 61318061501550 is 5510516081316.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 267766990 + ... + 267995889.

It is an arithmetic number, because the mean of its divisors is an integer number (1826951420800).

Almost surely, 2^{61318061501550} is an apocalyptic number.

61318061501550 is an abundant number, since it is smaller than the sum of its proper divisors (114069274895250).

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

61318061501550 is a wasteful number, since it uses less digits than its factorization.

61318061501550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535763010 (or 535763005 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 42.

Adding to 61318061501550 its reverse (5510516081316), we get a palindrome (66828577582866).

The spelling of 61318061501550 in words is "sixty-one trillion, three hundred eighteen billion, sixty-one million, five hundred one thousand, five hundred fifty".