243151177561761 has 16 divisors (see below), whose sum is σ = 370581554048000. Its totient is φ = 138918977302608.

The previous prime is 243151177561697. The next prime is 243151177561793. The reversal of 243151177561761 is 167165771151342.

It is not a de Polignac number, because 243151177561761 - 2⁶ = 243151177561697 is a prime.

It is a super-2 number, since 2×243151177561761² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243151177561661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1022908861 + ... + 1023146538.

It is an arithmetic number, because the mean of its divisors is an integer number (23161347128000).

Almost surely, 2^{243151177561761} is an apocalyptic number.

243151177561761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

243151177561761 is a deficient number, since it is larger than the sum of its proper divisors (127430376486239).

243151177561761 is a wasteful number, since it uses less digits than its factorization.

243151177561761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046061068.

The product of its digits is 7408800, while the sum is 57.

The spelling of 243151177561761 in words is "two hundred forty-three trillion, one hundred fifty-one billion, one hundred seventy-seven million, five hundred sixty-one thousand, seven hundred sixty-one".