15611061312 has 840 divisors, whose sum is σ = 60711697728. Its totient is φ = 3919104000.

The previous prime is 15611061299. The next prime is 15611061341. The reversal of 15611061312 is 21316011651.

15611061312 is a `hidden beast` number, since 1 + 561 + 10 + 61 + 31 + 2 = 666.

It is a super-2 number, since 2×15611061312² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 103384437 + ... + 103384587.

Almost surely, 2^15611061312 is an apocalyptic number.

15611061312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15611061312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30355848864).

15611061312 is an abundant number, since it is smaller than the sum of its proper divisors (45100636416).

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

15611061312 is a wasteful number, since it uses less digits than its factorization.

15611061312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 15611061312 its reverse (21316011651), we get a palindrome (36927072963).

The spelling of 15611061312 in words is "fifteen billion, six hundred eleven million, sixty-one thousand, three hundred twelve".