661037338 has 32 divisors (see below), whose sum is σ = 1111831056. Its totient is φ = 292750848.

The previous prime is 661037329. The next prime is 661037347. The reversal of 661037338 is 833730166.

It is an interprime number because it is at equal distance from previous prime (661037329) and next prime (661037347).

It can be written as a sum of positive squares in 8 ways, for example, as 584527329 + 76510009 = 24177^2 + 8747^2 .

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a junction number, because it is equal to n+sod(n) for n = 661037297 and 661037306.

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, 65520 + ... + 74932.

Almost surely, 2^661037338 is an apocalyptic number.

661037338 is a deficient number, since it is larger than the sum of its proper divisors (450793718).

661037338 is a wasteful number, since it uses less digits than its factorization.

661037338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9538.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 661037338 is about 25710.6463940524. The cubic root of 661037338 is about 871.1146755124.

It can be divided in two parts, 66103 and 7338, that added together give a square (73441 = 271²).

The spelling of 661037338 in words is "six hundred sixty-one million, thirty-seven thousand, three hundred thirty-eight".