612737671661 has 32 divisors (see below), whose sum is σ = 642143040000. Its totient is φ = 584343631872.

The previous prime is 612737671657. The next prime is 612737671669. The reversal of 612737671661 is 166176737216.

It is a cyclic number.

It is not a de Polignac number, because 612737671661 - 2² = 612737671657 is a prime.

It is a super-3 number, since 3×612737671661³ (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 (612737671669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55957415 + ... + 55968363.

It is an arithmetic number, because the mean of its divisors is an integer number (20066970000).

Almost surely, 2^612737671661 is an apocalyptic number.

It is an amenable number.

612737671661 is a deficient number, since it is larger than the sum of its proper divisors (29405368339).

612737671661 is a wasteful number, since it uses less digits than its factorization.

612737671661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11301.

The product of its digits is 2667168, while the sum is 53.

The spelling of 612737671661 in words is "six hundred twelve billion, seven hundred thirty-seven million, six hundred seventy-one thousand, six hundred sixty-one".