61645264361 has 4 divisors (see below), whose sum is σ = 61937422224. Its totient is φ = 61353106500.

The previous prime is 61645264339. The next prime is 61645264397. The reversal of 61645264361 is 16346254616.

61645264361 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 61645264361 - 2⁶ = 61645264297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61645260361) 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, 146078615 + ... + 146079036.

It is an arithmetic number, because the mean of its divisors is an integer number (15484355556).

Almost surely, 2^61645264361 is an apocalyptic number.

It is an amenable number.

61645264361 is a deficient number, since it is larger than the sum of its proper divisors (292157863).

61645264361 is a wasteful number, since it uses less digits than its factorization.

61645264361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292157862.

The product of its digits is 622080, while the sum is 44.

The spelling of 61645264361 in words is "sixty-one billion, six hundred forty-five million, two hundred sixty-four thousand, three hundred sixty-one".