1621015465723 has 2 divisors, whose sum is σ = 1621015465724. Its totient is φ = 1621015465722.

The previous prime is 1621015465709. The next prime is 1621015465733. The reversal of 1621015465723 is 3275645101261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621015465723 - 2⁹ = 1621015465211 is a prime.

It is a super-2 number, since 2×1621015465723² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1621015465723.

It is not a weakly prime, because it can be changed into another prime (1621015465733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810507732861 + 810507732862.

It is an arithmetic number, because the mean of its divisors is an integer number (810507732862).

Almost surely, 2^{1621015465723} is an apocalyptic number.

1621015465723 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621015465723 is an equidigital number, since it uses as much as digits as its factorization.

1621015465723 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 1621015465723 in words is "one trillion, six hundred twenty-one billion, fifteen million, four hundred sixty-five thousand, seven hundred twenty-three".