77023440437 has 2 divisors, whose sum is σ = 77023440438. Its totient is φ = 77023440436.

The previous prime is 77023440409. The next prime is 77023440449. The reversal of 77023440437 is 73404432077.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 69110626321 + 7912814116 = 262889^2 + 88954^2 .

It is a cyclic number.

It is not a de Polignac number, because 77023440437 - 2⁸ = 77023440181 is a prime.

It is a super-2 number, since 2×77023440437² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77023440394 and 77023440403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77023440457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38511720218 + 38511720219.

It is an arithmetic number, because the mean of its divisors is an integer number (38511720219).

Almost surely, 2^77023440437 is an apocalyptic number.

It is an amenable number.

77023440437 is a deficient number, since it is larger than the sum of its proper divisors (1).

77023440437 is an equidigital number, since it uses as much as digits as its factorization.

77023440437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 395136, while the sum is 41.

The spelling of 77023440437 in words is "seventy-seven billion, twenty-three million, four hundred forty thousand, four hundred thirty-seven".