1381651546520 has 64 divisors (see below), whose sum is σ = 3592737633600. Its totient is φ = 468386519040.

The previous prime is 1381651546507. The next prime is 1381651546523. The reversal of 1381651546520 is 256451561831.

It is a super-2 number, since 2×1381651546520² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381651546523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27696821 + ... + 27746660.

It is an arithmetic number, because the mean of its divisors is an integer number (56136525525).

Almost surely, 2^{1381651546520} is an apocalyptic number.

1381651546520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1381651546520 is an abundant number, since it is smaller than the sum of its proper divisors (2211086087080).

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

1381651546520 is a wasteful number, since it uses less digits than its factorization.

1381651546520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55443588 (or 55443584 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 1381651546520 in words is "one trillion, three hundred eighty-one billion, six hundred fifty-one million, five hundred forty-six thousand, five hundred twenty".