15406779493 has 8 divisors (see below), whose sum is σ = 17982381312. Its totient is φ = 12924836016.

The previous prime is 15406779491. The next prime is 15406779503. The reversal of 15406779493 is 39497760451.

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

It is a cyclic number.

It is not a de Polignac number, because 15406779493 - 2¹ = 15406779491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15406779491) 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, 23414230 + ... + 23414887.

It is an arithmetic number, because the mean of its divisors is an integer number (2247797664).

Almost surely, 2^15406779493 is an apocalyptic number.

It is an amenable number.

15406779493 is a deficient number, since it is larger than the sum of its proper divisors (2575601819).

15406779493 is an equidigital number, since it uses as much as digits as its factorization.

15406779493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46829171.

The product of its (nonzero) digits is 5715360, while the sum is 55.

The spelling of 15406779493 in words is "fifteen billion, four hundred six million, seven hundred seventy-nine thousand, four hundred ninety-three".