2177861132404 has 6 divisors (see below), whose sum is σ = 3811256981714. Its totient is φ = 1088930566200.

The previous prime is 2177861132401. The next prime is 2177861132411. The reversal of 2177861132404 is 4042311687712.

It can be written as a sum of positive squares in only one way, i.e., 1471417520400 + 706443612004 = 1213020^2 + 840502^2 .

It is a super-2 number, since 2×2177861132404² (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 (2177861132401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272232641547 + ... + 272232641554.

Almost surely, 2^{2177861132404} is an apocalyptic number.

It is an amenable number.

2177861132404 is a deficient number, since it is larger than the sum of its proper divisors (1633395849310).

2177861132404 is a wasteful number, since it uses less digits than its factorization.

2177861132404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 544465283105 (or 544465283103 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 46.

The spelling of 2177861132404 in words is "two trillion, one hundred seventy-seven billion, eight hundred sixty-one million, one hundred thirty-two thousand, four hundred four".