65878771761 has 24 divisors (see below), whose sum is σ = 104106475200. Its totient is φ = 39812104800.

The previous prime is 65878771759. The next prime is 65878771781. The reversal of 65878771761 is 16717787856.

65878771761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 65878771761 - 2¹ = 65878771759 is a prime.

It is a super-2 number, since 2×65878771761² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (65878771781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 918805 + ... + 987906.

It is an arithmetic number, because the mean of its divisors is an integer number (4337769800).

Almost surely, 2^65878771761 is an apocalyptic number.

It is an amenable number.

65878771761 is a deficient number, since it is larger than the sum of its proper divisors (38227703439).

65878771761 is a wasteful number, since it uses less digits than its factorization.

65878771761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907077 (or 1907074 counting only the distinct ones).

The product of its digits is 27659520, while the sum is 63.

The spelling of 65878771761 in words is "sixty-five billion, eight hundred seventy-eight million, seven hundred seventy-one thousand, seven hundred sixty-one".