661070157 has 16 divisors (see below), whose sum is σ = 987546432. Its totient is φ = 389819520.

The previous prime is 661070153. The next prime is 661070159. The reversal of 661070157 is 751070166.

661070157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661070157 - 2² = 661070153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661070153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269488 + ... + 271929.

It is an arithmetic number, because the mean of its divisors is an integer number (61721652).

Almost surely, 2^661070157 is an apocalyptic number.

It is an amenable number.

661070157 is a deficient number, since it is larger than the sum of its proper divisors (326476275).

661070157 is a wasteful number, since it uses less digits than its factorization.

661070157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541468.

The product of its (nonzero) digits is 8820, while the sum is 33.

The square root of 661070157 is about 25711.2846236823. The cubic root of 661070157 is about 871.1290915612.

Subtracting 661070157 from its reverse (751070166), we obtain a palindrome (90000009).

It can be divided in two parts, 6610 and 70157, that added together give a palindrome (76767).

The spelling of 661070157 in words is "six hundred sixty-one million, seventy thousand, one hundred fifty-seven".