1534867661 has 8 divisors (see below), whose sum is σ = 1625504760. Its totient is φ = 1444269568.

The previous prime is 1534867643. The next prime is 1534867669. The reversal of 1534867661 is 1667684351.

It can be written as a sum of positive squares in 4 ways, for example, as 433888900 + 1100978761 = 20830^2 + 33181^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1534867661 is a prime.

It is a super-2 number, since 2×1534867661² = 4711637473567221842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1534867669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123065 + ... + 134961.

It is an arithmetic number, because the mean of its divisors is an integer number (203188095).

Almost surely, 2^1534867661 is an apocalyptic number.

It is an amenable number.

1534867661 is a deficient number, since it is larger than the sum of its proper divisors (90637099).

1534867661 is a wasteful number, since it uses less digits than its factorization.

1534867661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19503.

The product of its digits is 725760, while the sum is 47.

The square root of 1534867661 is about 39177.3871129763. The cubic root of 1534867661 is about 1153.5160595599.

The spelling of 1534867661 in words is "one billion, five hundred thirty-four million, eight hundred sixty-seven thousand, six hundred sixty-one".