1530640661 has 16 divisors (see below), whose sum is σ = 1699630080. Its totient is φ = 1366746480.

The previous prime is 1530640651. The next prime is 1530640663. The reversal of 1530640661 is 1660460351.

It is not a de Polignac number, because 1530640661 - 2²² = 1526446357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1530640663) 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, 267650 + ... + 273308.

It is an arithmetic number, because the mean of its divisors is an integer number (106226880).

Almost surely, 2^1530640661 is an apocalyptic number.

1530640661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1530640661 is a deficient number, since it is larger than the sum of its proper divisors (168989419).

1530640661 is a wasteful number, since it uses less digits than its factorization.

1530640661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 1530640661 is about 39123.4029833807. The cubic root of 1530640661 is about 1152.4561646410.

The spelling of 1530640661 in words is "one billion, five hundred thirty million, six hundred forty thousand, six hundred sixty-one".