71970939077 has 4 divisors (see below), whose sum is σ = 72009284556. Its totient is φ = 71932593600.

The previous prime is 71970939041. The next prime is 71970939083. The reversal of 71970939077 is 77093907917.

It is a Cunningham number, because it is equal to 268274²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45048364516 + 26922574561 = 212246^2 + 164081^2 .

It is a cyclic number.

It is not a de Polignac number, because 71970939077 - 2²⁴ = 71954161861 is a prime.

It is a super-2 number, since 2×71970939077² (a number of 23 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 (71970939377) 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, 19169924 + ... + 19173677.

It is an arithmetic number, because the mean of its divisors is an integer number (18002321139).

Almost surely, 2^71970939077 is an apocalyptic number.

It is an amenable number.

71970939077 is a deficient number, since it is larger than the sum of its proper divisors (38345479).

71970939077 is a wasteful number, since it uses less digits than its factorization.

71970939077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38345478.

The product of its (nonzero) digits is 5250987, while the sum is 59.

The spelling of 71970939077 in words is "seventy-one billion, nine hundred seventy million, nine hundred thirty-nine thousand, seventy-seven".