61974964537 has 4 divisors (see below), whose sum is σ = 61975569040. Its totient is φ = 61974360036.

The previous prime is 61974964507. The next prime is 61974964543. The reversal of 61974964537 is 73546947916.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61974964537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61974964507) 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, 105987 + ... + 367672.

It is an arithmetic number, because the mean of its divisors is an integer number (15493892260).

Almost surely, 2^61974964537 is an apocalyptic number.

It is an amenable number.

61974964537 is a deficient number, since it is larger than the sum of its proper divisors (604503).

61974964537 is a wasteful number, since it uses less digits than its factorization.

61974964537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604502.

The product of its digits is 34292160, while the sum is 61.

The spelling of 61974964537 in words is "sixty-one billion, nine hundred seventy-four million, nine hundred sixty-four thousand, five hundred thirty-seven".