61437917477 has 4 divisors (see below), whose sum is σ = 61439619936. Its totient is φ = 61436215020.

The previous prime is 61437917473. The next prime is 61437917501. The reversal of 61437917477 is 77471973416.

It is a happy number.

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 61437917477 - 2² = 61437917473 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 (61437917473) 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, 795899 + ... + 869672.

It is an arithmetic number, because the mean of its divisors is an integer number (15359904984).

Almost surely, 2^61437917477 is an apocalyptic number.

It is an amenable number.

61437917477 is a deficient number, since it is larger than the sum of its proper divisors (1702459).

61437917477 is a wasteful number, since it uses less digits than its factorization.

61437917477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1702458.

The product of its digits is 6223392, while the sum is 56.

The spelling of 61437917477 in words is "sixty-one billion, four hundred thirty-seven million, nine hundred seventeen thousand, four hundred seventy-seven".