2742407511661 has 4 divisors (see below), whose sum is σ = 2756328362172. Its totient is φ = 2728486661152.

The previous prime is 2742407511629. The next prime is 2742407511719. The reversal of 2742407511661 is 1661157042472.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1587171628900 + 1155235882761 = 1259830^2 + 1074819^2 .

It is a cyclic number.

It is not a de Polignac number, because 2742407511661 - 2⁵ = 2742407511629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2742407511611) 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, 6960424960 + ... + 6960425353.

It is an arithmetic number, because the mean of its divisors is an integer number (689082090543).

Almost surely, 2^{2742407511661} is an apocalyptic number.

It is an amenable number.

2742407511661 is a deficient number, since it is larger than the sum of its proper divisors (13920850511).

2742407511661 is a wasteful number, since it uses less digits than its factorization.

2742407511661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13920850510.

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 2742407511661 in words is "two trillion, seven hundred forty-two billion, four hundred seven million, five hundred eleven thousand, six hundred sixty-one".