77920995739 has 2 divisors, whose sum is σ = 77920995740. Its totient is φ = 77920995738.

The previous prime is 77920995689. The next prime is 77920995791. The reversal of 77920995739 is 93759902977.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 77920995739 - 2⁹ = 77920995227 is a prime.

It is a super-2 number, since 2×77920995739² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77920905739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38960497869 + 38960497870.

It is an arithmetic number, because the mean of its divisors is an integer number (38960497870).

Almost surely, 2^77920995739 is an apocalyptic number.

77920995739 is a deficient number, since it is larger than the sum of its proper divisors (1).

77920995739 is an equidigital number, since it uses as much as digits as its factorization.

77920995739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67512690, while the sum is 67.

The spelling of 77920995739 in words is "seventy-seven billion, nine hundred twenty million, nine hundred ninety-five thousand, seven hundred thirty-nine".