780734934881 has 4 divisors (see below), whose sum is σ = 851710838064. Its totient is φ = 709759031700.

The previous prime is 780734934857. The next prime is 780734934883. The reversal of 780734934881 is 188439437087.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780734934881 is a prime.

It is a super-2 number, since 2×780734934881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (780734934883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35487951575 + ... + 35487951596.

It is an arithmetic number, because the mean of its divisors is an integer number (212927709516).

Almost surely, 2^780734934881 is an apocalyptic number.

It is an amenable number.

780734934881 is a deficient number, since it is larger than the sum of its proper divisors (70975903183).

780734934881 is a wasteful number, since it uses less digits than its factorization.

780734934881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70975903182.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 780734934881 in words is "seven hundred eighty billion, seven hundred thirty-four million, nine hundred thirty-four thousand, eight hundred eighty-one".