64711442690 has 16 divisors (see below), whose sum is σ = 116757280440. Its totient is φ = 25823091840.

The previous prime is 64711442681. The next prime is 64711442717. The reversal of 64711442690 is 9624411746.

It can be written as a sum of positive squares in 4 ways, for example, as 52656939841 + 12054502849 = 229471^2 + 109793^2 .

It is a super-2 number, since 2×64711442690² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7681235 + ... + 7689654.

Almost surely, 2^64711442690 is an apocalyptic number.

64711442690 is a deficient number, since it is larger than the sum of its proper divisors (52045837750).

64711442690 is a wasteful number, since it uses less digits than its factorization.

64711442690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15371317.

The product of its (nonzero) digits is 290304, while the sum is 44.

The spelling of 64711442690 in words is "sixty-four billion, seven hundred eleven million, four hundred forty-two thousand, six hundred ninety".