15551315412 has 24 divisors (see below), whose sum is σ = 36288422016. Its totient is φ = 5183483328.

The previous prime is 15551315411. The next prime is 15551315431. The reversal of 15551315412 is 21451315551.

It is a happy number.

It is a super-2 number, since 2×15551315412² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15551315411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388528 + ... + 426680.

It is an arithmetic number, because the mean of its divisors is an integer number (1512017584).

Almost surely, 2^15551315412 is an apocalyptic number.

15551315412 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15551315412 is an abundant number, since it is smaller than the sum of its proper divisors (20737106604).

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

15551315412 is a wasteful number, since it uses less digits than its factorization.

15551315412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72127 (or 72125 counting only the distinct ones).

The product of its digits is 15000, while the sum is 33.

The spelling of 15551315412 in words is "fifteen billion, five hundred fifty-one million, three hundred fifteen thousand, four hundred twelve".