654801102421 has 4 divisors (see below), whose sum is σ = 655822633644. Its totient is φ = 653779571200.

The previous prime is 654801102407. The next prime is 654801102457. The reversal of 654801102421 is 124201108456.

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

It can be written as a sum of positive squares in 2 ways, for example, as 540952895025 + 113848207396 = 735495^2 + 337414^2 .

It is a cyclic number.

It is not a de Polignac number, because 654801102421 - 2²¹ = 654799005269 is a prime.

It is a super-2 number, since 2×654801102421² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (654801102721) 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, 510764650 + ... + 510765931.

It is an arithmetic number, because the mean of its divisors is an integer number (163955658411).

Almost surely, 2^654801102421 is an apocalyptic number.

It is an amenable number.

654801102421 is a deficient number, since it is larger than the sum of its proper divisors (1021531223).

654801102421 is a wasteful number, since it uses less digits than its factorization.

654801102421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021531222.

The product of its (nonzero) digits is 15360, while the sum is 34.

The spelling of 654801102421 in words is "six hundred fifty-four billion, eight hundred one million, one hundred two thousand, four hundred twenty-one".