15681810153680 has 80 divisors (see below), whose sum is σ = 40744889535168. Its totient is φ = 5563391616000.

The previous prime is 15681810153661. The next prime is 15681810153689. The reversal of 15681810153680 is 8635101818651.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×15681810153680² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15681810153689) 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, 217283906 + ... + 217356065.

Almost surely, 2^{15681810153680} is an apocalyptic number.

15681810153680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15681810153680 is an abundant number, since it is smaller than the sum of its proper divisors (25063079381488).

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

15681810153680 is a wasteful number, since it uses less digits than its factorization.

15681810153680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434640036 (or 434640030 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 53.

The spelling of 15681810153680 in words is "fifteen trillion, six hundred eighty-one billion, eight hundred ten million, one hundred fifty-three thousand, six hundred eighty".