1661412415 has 8 divisors (see below), whose sum is σ = 2147056128. Its totient is φ = 1226889120.

The previous prime is 1661412391. The next prime is 1661412427. The reversal of 1661412415 is 5142141661.

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

It is not a de Polignac number, because 1661412415 - 2⁹ = 1661411903 is a prime.

It is a super-2 number, since 2×1661412415² = 5520582425432264450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12780031 + ... + 12780160.

It is an arithmetic number, because the mean of its divisors is an integer number (268382016).

Almost surely, 2^1661412415 is an apocalyptic number.

1661412415 is a deficient number, since it is larger than the sum of its proper divisors (485643713).

1661412415 is a wasteful number, since it uses less digits than its factorization.

1661412415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25560209.

The product of its digits is 5760, while the sum is 31.

The square root of 1661412415 is about 40760.4270708735. The cubic root of 1661412415 is about 1184.3838690842.

The spelling of 1661412415 in words is "one billion, six hundred sixty-one million, four hundred twelve thousand, four hundred fifteen".