65816261690 has 16 divisors (see below), whose sum is σ = 118501073928. Its totient is φ = 26319437376.

The previous prime is 65816261689. The next prime is 65816261737. The reversal of 65816261690 is 9616261856.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 37519302601 + 28296959089 = 193699^2 + 168217^2 .

It is a super-2 number, since 2×65816261690² (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, 844217 + ... + 918876.

Almost surely, 2^65816261690 is an apocalyptic number.

65816261690 is a deficient number, since it is larger than the sum of its proper divisors (52684812238).

65816261690 is a wasteful number, since it uses less digits than its factorization.

65816261690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766833.

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 65816261690 in words is "sixty-five billion, eight hundred sixteen million, two hundred sixty-one thousand, six hundred ninety".