61464375521 has 4 divisors (see below), whose sum is σ = 63447097344. Its totient is φ = 59481653700.

The previous prime is 61464375503. The next prime is 61464375587. The reversal of 61464375521 is 12557346416.

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 61464375521 - 2⁶ = 61464375457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61464372521) 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, 991360865 + ... + 991360926.

It is an arithmetic number, because the mean of its divisors is an integer number (15861774336).

Almost surely, 2^61464375521 is an apocalyptic number.

It is an amenable number.

61464375521 is a deficient number, since it is larger than the sum of its proper divisors (1982721823).

61464375521 is a wasteful number, since it uses less digits than its factorization.

61464375521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1982721822.

The product of its digits is 604800, while the sum is 44.

The spelling of 61464375521 in words is "sixty-one billion, four hundred sixty-four million, three hundred seventy-five thousand, five hundred twenty-one".