77400021503 has 4 divisors (see below), whose sum is σ = 88457167440. Its totient is φ = 66342875568.

The previous prime is 77400021443. The next prime is 77400021527. The reversal of 77400021503 is 30512000477.

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

It is a cyclic number.

It is not a de Polignac number, because 77400021503 - 2²² = 77395827199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77400021553) 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, 5528572958 + ... + 5528572971.

It is an arithmetic number, because the mean of its divisors is an integer number (22114291860).

Almost surely, 2^77400021503 is an apocalyptic number.

77400021503 is a deficient number, since it is larger than the sum of its proper divisors (11057145937).

77400021503 is a wasteful number, since it uses less digits than its factorization.

77400021503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11057145936.

The product of its (nonzero) digits is 5880, while the sum is 29.

The spelling of 77400021503 in words is "seventy-seven billion, four hundred million, twenty-one thousand, five hundred three".