70440376781 has 4 divisors (see below), whose sum is σ = 71332027200. Its totient is φ = 69548726364.

The previous prime is 70440376777. The next prime is 70440376823. The reversal of 70440376781 is 18767304407.

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 not a de Polignac number, because 70440376781 - 2² = 70440376777 is a prime.

It is a super-2 number, since 2×70440376781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70440376381) 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, 445825091 + ... + 445825248.

It is an arithmetic number, because the mean of its divisors is an integer number (17833006800).

Almost surely, 2^70440376781 is an apocalyptic number.

It is an amenable number.

70440376781 is a deficient number, since it is larger than the sum of its proper divisors (891650419).

70440376781 is an equidigital number, since it uses as much as digits as its factorization.

70440376781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891650418.

The product of its (nonzero) digits is 790272, while the sum is 47.

The spelling of 70440376781 in words is "seventy billion, four hundred forty million, three hundred seventy-six thousand, seven hundred eighty-one".