611620064661 has 16 divisors (see below), whose sum is σ = 860100638400. Its totient is φ = 385527426048.

The previous prime is 611620064659. The next prime is 611620064681. The reversal of 611620064661 is 166460026116.

It is a happy number.

It is not a de Polignac number, because 611620064661 - 2¹ = 611620064659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (611620064611) 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, 10511436 + ... + 10569461.

It is an arithmetic number, because the mean of its divisors is an integer number (53756289900).

Almost surely, 2^611620064661 is an apocalyptic number.

It is an amenable number.

611620064661 is a deficient number, since it is larger than the sum of its proper divisors (248480573739).

611620064661 is a wasteful number, since it uses less digits than its factorization.

611620064661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21081428.

The product of its (nonzero) digits is 62208, while the sum is 39.

The spelling of 611620064661 in words is "six hundred eleven billion, six hundred twenty million, sixty-four thousand, six hundred sixty-one".