661754534 has 32 divisors (see below), whose sum is σ = 1201374720. Its totient is φ = 267055488.

The previous prime is 661754531. The next prime is 661754539. The reversal of 661754534 is 435457166.

661754534 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 661754491 and 661754500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661754531) 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, 36974 + ... + 51870.

It is an arithmetic number, because the mean of its divisors is an integer number (37542960).

Almost surely, 2^661754534 is an apocalyptic number.

661754534 is a deficient number, since it is larger than the sum of its proper divisors (539620186).

661754534 is a wasteful number, since it uses less digits than its factorization.

661754534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15092.

The product of its digits is 302400, while the sum is 41.

The square root of 661754534 is about 25724.5900647610. The cubic root of 661754534 is about 871.4296018237.

The spelling of 661754534 in words is "six hundred sixty-one million, seven hundred fifty-four thousand, five hundred thirty-four".