721140401455 has 16 divisors (see below), whose sum is σ = 947868117120. Its totient is φ = 524252979712.

The previous prime is 721140401447. The next prime is 721140401479. The reversal of 721140401455 is 554104041127.

It is a cyclic number.

It is not a de Polignac number, because 721140401455 - 2³ = 721140401447 is a prime.

It is a super-2 number, since 2×721140401455² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 721140401455.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 146273479 + ... + 146278408.

It is an arithmetic number, because the mean of its divisors is an integer number (59241757320).

Almost surely, 2^721140401455 is an apocalyptic number.

721140401455 is a deficient number, since it is larger than the sum of its proper divisors (226727715665).

721140401455 is a wasteful number, since it uses less digits than its factorization.

721140401455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292551938.

The product of its (nonzero) digits is 22400, while the sum is 34.

The spelling of 721140401455 in words is "seven hundred twenty-one billion, one hundred forty million, four hundred one thousand, four hundred fifty-five".