37947661481 has 8 divisors (see below), whose sum is σ = 38095504200. Its totient is φ = 37800077440.

The previous prime is 37947661463. The next prime is 37947661487. The reversal of 37947661481 is 18416674973.

It can be written as a sum of positive squares in 4 ways, for example, as 2609677225 + 35337984256 = 51085^2 + 187984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-37947661481 is a prime.

It is a super-2 number, since 2×37947661481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (37947661487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 231935 + ... + 360123.

It is an arithmetic number, because the mean of its divisors is an integer number (4761938025).

Almost surely, 2^37947661481 is an apocalyptic number.

It is an amenable number.

37947661481 is a deficient number, since it is larger than the sum of its proper divisors (147842719).

37947661481 is a wasteful number, since it uses less digits than its factorization.

37947661481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129339.

The product of its digits is 6096384, while the sum is 56.

The spelling of 37947661481 in words is "thirty-seven billion, nine hundred forty-seven million, six hundred sixty-one thousand, four hundred eighty-one".