1661625320131 has 6 divisors (see below), whose sum is σ = 1932911086740. Its totient is φ = 1424250274356.

The previous prime is 1661625320111. The next prime is 1661625320183. The reversal of 1661625320131 is 1310235261661.

It is not a de Polignac number, because 1661625320131 - 2¹³ = 1661625311939 is a prime.

It is a super-2 number, since 2×1661625320131² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1661625320111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16955360361 + ... + 16955360458.

It is an arithmetic number, because the mean of its divisors is an integer number (322151847790).

Almost surely, 2^{1661625320131} is an apocalyptic number.

1661625320131 is a deficient number, since it is larger than the sum of its proper divisors (271285766609).

1661625320131 is an equidigital number, since it uses as much as digits as its factorization.

1661625320131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33910720833 (or 33910720826 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 37.

The spelling of 1661625320131 in words is "one trillion, six hundred sixty-one billion, six hundred twenty-five million, three hundred twenty thousand, one hundred thirty-one".