2051663256742 has 32 divisors (see below), whose sum is σ = 3637422163584. Its totient is φ = 857304873600.

The previous prime is 2051663256719. The next prime is 2051663256761. The reversal of 2051663256742 is 2476523661502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63771484 + ... + 63803647.

It is an arithmetic number, because the mean of its divisors is an integer number (113669442612).

Almost surely, 2^{2051663256742} is an apocalyptic number.

2051663256742 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2051663256742 is a deficient number, since it is larger than the sum of its proper divisors (1585758906842).

2051663256742 is a wasteful number, since it uses less digits than its factorization.

2051663256742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127575204.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 2051663256742 in words is "two trillion, fifty-one billion, six hundred sixty-three million, two hundred fifty-six thousand, seven hundred forty-two".