1861692632648 has 8 divisors (see below), whose sum is σ = 3490673686230. Its totient is φ = 930846316320.

The previous prime is 1861692632647. The next prime is 1861692632671. The reversal of 1861692632648 is 8462362961681.

It can be written as a sum of positive squares in only one way, i.e., 1846332004804 + 15360627844 = 1358798^2 + 123938^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1861692632647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 116355789533 + ... + 116355789548.

Almost surely, 2^{1861692632648} is an apocalyptic number.

It is an amenable number.

1861692632648 is a deficient number, since it is larger than the sum of its proper divisors (1628981053582).

1861692632648 is a wasteful number, since it uses less digits than its factorization.

1861692632648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232711579087 (or 232711579083 counting only the distinct ones).

The product of its digits is 35831808, while the sum is 62.

The spelling of 1861692632648 in words is "one trillion, eight hundred sixty-one billion, six hundred ninety-two million, six hundred thirty-two thousand, six hundred forty-eight".