616117901781 has 16 divisors (see below), whose sum is σ = 852885763200. Its totient is φ = 395149919808.

The previous prime is 616117901779. The next prime is 616117901783. The reversal of 616117901781 is 187109711616.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (616117901779) and next prime (616117901783).

It is not a de Polignac number, because 616117901781 - 2¹ = 616117901779 is a prime.

It is a super-2 number, since 2×616117901781² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 616117901781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616117901783) 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, 12758961 + ... + 12807158.

It is an arithmetic number, because the mean of its divisors is an integer number (53305360200).

Almost surely, 2^616117901781 is an apocalyptic number.

It is an amenable number.

616117901781 is a deficient number, since it is larger than the sum of its proper divisors (236767861419).

616117901781 is a wasteful number, since it uses less digits than its factorization.

616117901781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25566428.

The product of its (nonzero) digits is 127008, while the sum is 48.

The spelling of 616117901781 in words is "six hundred sixteen billion, one hundred seventeen million, nine hundred one thousand, seven hundred eighty-one".