2156466064542 has 24 divisors (see below), whose sum is σ = 4415565474504. Its totient is φ = 702105226704.

The previous prime is 2156466064469. The next prime is 2156466064549. The reversal of 2156466064542 is 2454606646512.

It is a super-2 number, since 2×2156466064542² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2156466064549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97179553 + ... + 97201740.

It is an arithmetic number, because the mean of its divisors is an integer number (183981894771).

Almost surely, 2^{2156466064542} is an apocalyptic number.

2156466064542 is an abundant number, since it is smaller than the sum of its proper divisors (2259099409962).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2156466064542 is a wasteful number, since it uses less digits than its factorization.

2156466064542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194381384 (or 194381341 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 51.

The spelling of 2156466064542 in words is "two trillion, one hundred fifty-six billion, four hundred sixty-six million, sixty-four thousand, five hundred forty-two".