61016623557 has 4 divisors (see below), whose sum is σ = 81355498080. Its totient is φ = 40677749036.

The previous prime is 61016623553. The next prime is 61016623583. The reversal of 61016623557 is 75532661016.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61016623557 - 2² = 61016623553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61016623553) 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, 10169437257 + ... + 10169437262.

It is an arithmetic number, because the mean of its divisors is an integer number (20338874520).

Almost surely, 2^61016623557 is an apocalyptic number.

It is an amenable number.

61016623557 is a deficient number, since it is larger than the sum of its proper divisors (20338874523).

61016623557 is a wasteful number, since it uses less digits than its factorization.

61016623557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20338874522.

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 61016623557 in words is "sixty-one billion, sixteen million, six hundred twenty-three thousand, five hundred fifty-seven".