420636657461 has 4 divisors (see below), whose sum is σ = 420644639424. Its totient is φ = 420628675500.

The previous prime is 420636657457. The next prime is 420636657491. The reversal of 420636657461 is 164756636024.

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 420636657461 - 2² = 420636657457 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 (420636657401) 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, 3911405 + ... + 4017506.

It is an arithmetic number, because the mean of its divisors is an integer number (105161159856).

Almost surely, 2^420636657461 is an apocalyptic number.

It is an amenable number.

420636657461 is a deficient number, since it is larger than the sum of its proper divisors (7981963).

420636657461 is an equidigital number, since it uses as much as digits as its factorization.

420636657461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7981962.

The product of its (nonzero) digits is 4354560, while the sum is 50.

The spelling of 420636657461 in words is "four hundred twenty billion, six hundred thirty-six million, six hundred fifty-seven thousand, four hundred sixty-one".