2500551031621 has 2 divisors, whose sum is σ = 2500551031622. Its totient is φ = 2500551031620.

The previous prime is 2500551031577. The next prime is 2500551031687. The reversal of 2500551031621 is 1261301550052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2300105892100 + 200445139521 = 1516610^2 + 447711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2500551031621 - 2⁷ = 2500551031493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2500551031691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1250275515810 + 1250275515811.

It is an arithmetic number, because the mean of its divisors is an integer number (1250275515811).

Almost surely, 2^{2500551031621} is an apocalyptic number.

It is an amenable number.

2500551031621 is a deficient number, since it is larger than the sum of its proper divisors (1).

2500551031621 is an equidigital number, since it uses as much as digits as its factorization.

2500551031621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 2500551031621 its reverse (1261301550052), we get a palindrome (3761852581673).

The spelling of 2500551031621 in words is "two trillion, five hundred billion, five hundred fifty-one million, thirty-one thousand, six hundred twenty-one".