1097665542 has 24 divisors (see below), whose sum is σ = 2428878816. Its totient is φ = 358103376.

The previous prime is 1097665507. The next prime is 1097665619. The reversal of 1097665542 is 2455667901.

1097665542 is a `hidden beast` number, since 1 + 0 + 97 + 6 + 6 + 554 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 647893 + ... + 649584.

It is an arithmetic number, because the mean of its divisors is an integer number (101203284).

Almost surely, 2^1097665542 is an apocalyptic number.

1097665542 is an abundant number, since it is smaller than the sum of its proper divisors (1331213274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1097665542 is a wasteful number, since it uses less digits than its factorization.

1097665542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1297532 (or 1297529 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The square root of 1097665542 is about 33131.0359330945. The cubic root of 1097665542 is about 1031.5493514209.

The spelling of 1097665542 in words is "one billion, ninety-seven million, six hundred sixty-five thousand, five hundred forty-two".