61616011643 has 4 divisors (see below), whose sum is σ = 61619592408. Its totient is φ = 61612430880.

The previous prime is 61616011627. The next prime is 61616011657. The reversal of 61616011643 is 34611061616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61616011643 - 2⁴ = 61616011627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61616011343) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1764446 + ... + 1799027.

It is an arithmetic number, because the mean of its divisors is an integer number (15404898102).

Almost surely, 2^61616011643 is an apocalyptic number.

61616011643 is a deficient number, since it is larger than the sum of its proper divisors (3580765).

61616011643 is a wasteful number, since it uses less digits than its factorization.

61616011643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3580764.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 61616011643 in words is "sixty-one billion, six hundred sixteen million, eleven thousand, six hundred forty-three".