1625037509891 has 2 divisors, whose sum is σ = 1625037509892. Its totient is φ = 1625037509890.

The previous prime is 1625037509827. The next prime is 1625037509923. The reversal of 1625037509891 is 1989057305261.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1625037509891 - 2⁶ = 1625037509827 is a prime.

It is not a weakly prime, because it can be changed into another prime (1625037589891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 812518754945 + 812518754946.

It is an arithmetic number, because the mean of its divisors is an integer number (812518754946).

Almost surely, 2^{1625037509891} is an apocalyptic number.

1625037509891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1625037509891 is an equidigital number, since it uses as much as digits as its factorization.

1625037509891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4082400, while the sum is 56.

The spelling of 1625037509891 in words is "one trillion, six hundred twenty-five billion, thirty-seven million, five hundred nine thousand, eight hundred ninety-one".