64940286436 has 6 divisors (see below), whose sum is σ = 113645501270. Its totient is φ = 32470143216.

The previous prime is 64940286413. The next prime is 64940286443. The reversal of 64940286436 is 63468204946.

It can be written as a sum of positive squares in only one way, i.e., 49882542336 + 15057744100 = 223344^2 + 122710^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8117535801 + ... + 8117535808.

Almost surely, 2^64940286436 is an apocalyptic number.

It is an amenable number.

64940286436 is a deficient number, since it is larger than the sum of its proper divisors (48705214834).

64940286436 is a wasteful number, since it uses less digits than its factorization.

64940286436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16235071613 (or 16235071611 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 52.

The spelling of 64940286436 in words is "sixty-four billion, nine hundred forty million, two hundred eighty-six thousand, four hundred thirty-six".