421686401655 has 8 divisors (see below), whose sum is σ = 674698242672. Its totient is φ = 224899414208.

The previous prime is 421686401621. The next prime is 421686401659. The reversal of 421686401655 is 556104686124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421686401655 - 2¹⁰ = 421686400631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421686401659) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14056213374 + ... + 14056213403.

It is an arithmetic number, because the mean of its divisors is an integer number (84337280334).

Almost surely, 2^421686401655 is an apocalyptic number.

421686401655 is a deficient number, since it is larger than the sum of its proper divisors (253011841017).

421686401655 is a wasteful number, since it uses less digits than its factorization.

421686401655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28112426785.

The product of its (nonzero) digits is 1382400, while the sum is 48.

The spelling of 421686401655 in words is "four hundred twenty-one billion, six hundred eighty-six million, four hundred one thousand, six hundred fifty-five".