2061657371651 has 2 divisors, whose sum is σ = 2061657371652. Its totient is φ = 2061657371650.

The previous prime is 2061657371633. The next prime is 2061657371707. The reversal of 2061657371651 is 1561737561602.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2061657371651 is a prime.

It is a super-2 number, since 2×2061657371651² (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 2061657371651.

It is not a weakly prime, because it can be changed into another prime (2061657371951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030828685825 + 1030828685826.

It is an arithmetic number, because the mean of its divisors is an integer number (1030828685826).

Almost surely, 2^{2061657371651} is an apocalyptic number.

2061657371651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061657371651 is an equidigital number, since it uses as much as digits as its factorization.

2061657371651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 2061657371651 in words is "two trillion, sixty-one billion, six hundred fifty-seven million, three hundred seventy-one thousand, six hundred fifty-one".