1621505150053 has 2 divisors, whose sum is σ = 1621505150054. Its totient is φ = 1621505150052.

The previous prime is 1621505149991. The next prime is 1621505150063. The reversal of 1621505150053 is 3500515051261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1303209462724 + 318295687329 = 1141582^2 + 564177^2 .

It is a cyclic number.

It is not a de Polignac number, because 1621505150053 - 2¹⁷ = 1621505018981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621505150063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810752575026 + 810752575027.

It is an arithmetic number, because the mean of its divisors is an integer number (810752575027).

Almost surely, 2^{1621505150053} is an apocalyptic number.

It is an amenable number.

1621505150053 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621505150053 is an equidigital number, since it uses as much as digits as its factorization.

1621505150053 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 1621505150053 in words is "one trillion, six hundred twenty-one billion, five hundred five million, one hundred fifty thousand, fifty-three".