1616855409291 has 32 divisors (see below), whose sum is σ = 2288098264320. Its totient is φ = 1012064937984.

The previous prime is 1616855409283. The next prime is 1616855409307. The reversal of 1616855409291 is 1929045586161.

It is not a de Polignac number, because 1616855409291 - 2³ = 1616855409283 is a prime.

It is a super-2 number, since 2×1616855409291² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1616855409271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44106216 + ... + 44142858.

It is an arithmetic number, because the mean of its divisors is an integer number (71503070760).

Almost surely, 2^{1616855409291} is an apocalyptic number.

1616855409291 is a deficient number, since it is larger than the sum of its proper divisors (671242855029).

1616855409291 is a wasteful number, since it uses less digits than its factorization.

1616855409291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38715.

The product of its (nonzero) digits is 4665600, while the sum is 57.

The spelling of 1616855409291 in words is "one trillion, six hundred sixteen billion, eight hundred fifty-five million, four hundred nine thousand, two hundred ninety-one".