1621464600551 has 2 divisors, whose sum is σ = 1621464600552. Its totient is φ = 1621464600550.

The previous prime is 1621464600533. The next prime is 1621464600559. The reversal of 1621464600551 is 1550064641261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621464600551 - 2³⁸ = 1346586693607 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1621464600499 and 1621464600508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621464600559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810732300275 + 810732300276.

It is an arithmetic number, because the mean of its divisors is an integer number (810732300276).

Almost surely, 2^{1621464600551} is an apocalyptic number.

1621464600551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621464600551 is an equidigital number, since it uses as much as digits as its factorization.

1621464600551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 1621464600551 in words is "one trillion, six hundred twenty-one billion, four hundred sixty-four million, six hundred thousand, five hundred fifty-one".