64739466550 has 24 divisors (see below), whose sum is σ = 131362264152. Its totient is φ = 23541624000.

The previous prime is 64739466541. The next prime is 64739466553. The reversal of 64739466550 is 5566493746.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a junction number, because it is equal to n+sod(n) for n = 64739466491 and 64739466500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64739466553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58853511 + ... + 58854610.

It is an arithmetic number, because the mean of its divisors is an integer number (5473427673).

Almost surely, 2^64739466550 is an apocalyptic number.

64739466550 is an abundant number, since it is smaller than the sum of its proper divisors (66622797602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64739466550 is a wasteful number, since it uses less digits than its factorization.

64739466550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117708144 (or 117708139 counting only the distinct ones).

The product of its (nonzero) digits is 16329600, while the sum is 55.

The spelling of 64739466550 in words is "sixty-four billion, seven hundred thirty-nine million, four hundred sixty-six thousand, five hundred fifty".