3970181557 has 4 divisors (see below), whose sum is σ = 3970333120. Its totient is φ = 3970029996.

The previous prime is 3970181533. The next prime is 3970181561. The reversal of 3970181557 is 7551810793.

3970181557 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7551810793 = 1049 ⋅7199057.

It is a cyclic number.

It is not a de Polignac number, because 3970181557 - 2¹⁵ = 3970148789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3970181587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25263 + ... + 92620.

It is an arithmetic number, because the mean of its divisors is an integer number (992583280).

Almost surely, 2^3970181557 is an apocalyptic number.

It is an amenable number.

3970181557 is a deficient number, since it is larger than the sum of its proper divisors (151563).

3970181557 is a wasteful number, since it uses less digits than its factorization.

3970181557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151562.

The product of its (nonzero) digits is 264600, while the sum is 46.

The square root of 3970181557 is about 63009.3767387045. The cubic root of 3970181557 is about 1583.4467239889.

The spelling of 3970181557 in words is "three billion, nine hundred seventy million, one hundred eighty-one thousand, five hundred fifty-seven".