421561541651 has 2 divisors, whose sum is σ = 421561541652. Its totient is φ = 421561541650.

The previous prime is 421561541633. The next prime is 421561541657. The reversal of 421561541651 is 156145165124.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 421561541651 - 2²⁶ = 421494432787 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421561541599 and 421561541608.

It is not a weakly prime, because it can be changed into another prime (421561541657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210780770825 + 210780770826.

It is an arithmetic number, because the mean of its divisors is an integer number (210780770826).

Almost surely, 2^421561541651 is an apocalyptic number.

421561541651 is a deficient number, since it is larger than the sum of its proper divisors (1).

421561541651 is an equidigital number, since it uses as much as digits as its factorization.

421561541651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 144000, while the sum is 41.

The spelling of 421561541651 in words is "four hundred twenty-one billion, five hundred sixty-one million, five hundred forty-one thousand, six hundred fifty-one".