616510101661 has 8 divisors (see below), whose sum is σ = 620669079000. Its totient is φ = 612351408960.

The previous prime is 616510101659. The next prime is 616510101671. The reversal of 616510101661 is 166101015616.

It can be written as a sum of positive squares in 4 ways, for example, as 311287000761 + 305223100900 = 557931^2 + 552470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 616510101661 - 2¹ = 616510101659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616510101611) 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, 6032851 + ... + 6134191.

It is an arithmetic number, because the mean of its divisors is an integer number (77583634875).

Almost surely, 2^616510101661 is an apocalyptic number.

It is an amenable number.

616510101661 is a deficient number, since it is larger than the sum of its proper divisors (4158977339).

616510101661 is a wasteful number, since it uses less digits than its factorization.

616510101661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142319.

The product of its (nonzero) digits is 6480, while the sum is 34.

The spelling of 616510101661 in words is "six hundred sixteen billion, five hundred ten million, one hundred one thousand, six hundred sixty-one".