1295640380644 has 27 divisors (see below), whose sum is σ = 2295352259977. Its totient is φ = 639921790304.

The previous prime is 1295640380633. The next prime is 1295640380651. The reversal of 1295640380644 is 4460830465921.

The square root of 1295640380644 is 1138262.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9430352100 + 1286210028544 = 97110^2 + 1134112^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1295640380591 and 1295640380600.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 188948064 + ... + 188954920.

Almost surely, 2^{1295640380644} is an apocalyptic number.

1295640380644 is the 1138262-nd square number.

It is an amenable number.

1295640380644 is a deficient number, since it is larger than the sum of its proper divisors (999711879333).

1295640380644 is an frugal number, since it uses more digits than its factorization.

1295640380644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13884 (or 6942 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 52.

The spelling of 1295640380644 in words is "one trillion, two hundred ninety-five billion, six hundred forty million, three hundred eighty thousand, six hundred forty-four".