77232740137421 has 4 divisors (see below), whose sum is σ = 84253898331744. Its totient is φ = 70211581943100.

The previous prime is 77232740137411. The next prime is 77232740137453. The reversal of 77232740137421 is 12473104723277.

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 77232740137421 - 2¹⁰ = 77232740136397 is a prime.

It is a super-2 number, since 2×77232740137421² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77232740137421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77232740137411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3510579097145 + ... + 3510579097166.

It is an arithmetic number, because the mean of its divisors is an integer number (21063474582936).

Almost surely, 2^{77232740137421} is an apocalyptic number.

It is an amenable number.

77232740137421 is a deficient number, since it is larger than the sum of its proper divisors (7021158194323).

77232740137421 is a wasteful number, since it uses less digits than its factorization.

77232740137421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7021158194322.

The product of its (nonzero) digits is 2765952, while the sum is 50.

The spelling of 77232740137421 in words is "seventy-seven trillion, two hundred thirty-two billion, seven hundred forty million, one hundred thirty-seven thousand, four hundred twenty-one".