616512322621 has 12 divisors (see below), whose sum is σ = 667614289428. Its totient is φ = 569062775424.

The previous prime is 616512322609. The next prime is 616512322633. The reversal of 616512322621 is 126223215616.

It is an interprime number because it is at equal distance from previous prime (616512322609) and next prime (616512322633).

It can be written as a sum of positive squares in 6 ways, for example, as 11360575396 + 605151747225 = 106586^2 + 777915^2 .

It is not a de Polignac number, because 616512322621 - 2⁵ = 616512322589 is a prime.

It is a super-3 number, since 3×616512322621³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616512322691) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4432491 + ... + 4569463.

It is an arithmetic number, because the mean of its divisors is an integer number (55634524119).

Almost surely, 2^616512322621 is an apocalyptic number.

It is an amenable number.

616512322621 is a deficient number, since it is larger than the sum of its proper divisors (51101966807).

616512322621 is a wasteful number, since it uses less digits than its factorization.

616512322621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163632 (or 163619 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The spelling of 616512322621 in words is "six hundred sixteen billion, five hundred twelve million, three hundred twenty-two thousand, six hundred twenty-one".