2061557545651 has 4 divisors (see below), whose sum is σ = 2061561742632. Its totient is φ = 2061553348672.

The previous prime is 2061557545639. The next prime is 2061557545667. The reversal of 2061557545651 is 1565457551602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2061557545651 - 2³⁹ = 1511801731763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2061557045651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1246345 + ... + 2382538.

It is an arithmetic number, because the mean of its divisors is an integer number (515390435658).

Almost surely, 2^{2061557545651} is an apocalyptic number.

2061557545651 is a deficient number, since it is larger than the sum of its proper divisors (4196981).

2061557545651 is an equidigital number, since it uses as much as digits as its factorization.

2061557545651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4196980.

The product of its (nonzero) digits is 6300000, while the sum is 52.

The spelling of 2061557545651 in words is "two trillion, sixty-one billion, five hundred fifty-seven million, five hundred forty-five thousand, six hundred fifty-one".