64845331551 has 72 divisors (see below), whose sum is σ = 126713568800. Its totient is φ = 31094616960.

The previous prime is 64845331547. The next prime is 64845331583. The reversal of 64845331551 is 15513354846.

64845331551 is a `hidden beast` number, since 6 + 48 + 4 + 53 + 3 + 1 + 551 = 666.

It is not a de Polignac number, because 64845331551 - 2² = 64845331547 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64845331497 and 64845331506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64845331511) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 228076 + ... + 426273.

Almost surely, 2^64845331551 is an apocalyptic number.

64845331551 is a deficient number, since it is larger than the sum of its proper divisors (61868237249).

64845331551 is a wasteful number, since it uses less digits than its factorization.

64845331551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654397 (or 654383 counting only the distinct ones).

The product of its digits is 864000, while the sum is 45.

The spelling of 64845331551 in words is "sixty-four billion, eight hundred forty-five million, three hundred thirty-one thousand, five hundred fifty-one".