661541270 has 32 divisors (see below), whose sum is σ = 1283657760. Its totient is φ = 244016640.

The previous prime is 661541269. The next prime is 661541357. The reversal of 661541270 is 72145166.

661541270 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175061 + ... + 178799.

It is an arithmetic number, because the mean of its divisors is an integer number (40114305).

Almost surely, 2^661541270 is an apocalyptic number.

661541270 is a deficient number, since it is larger than the sum of its proper divisors (622116490).

661541270 is a wasteful number, since it uses less digits than its factorization.

661541270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 661541270 is about 25720.4445918028. Note that the first 3 decimals coincide. The cubic root of 661541270 is about 871.3359797324.

The spelling of 661541270 in words is "six hundred sixty-one million, five hundred forty-one thousand, two hundred seventy".