15421430691 has 6 divisors (see below), whose sum is σ = 22275399900. Its totient is φ = 10280953788.

The previous prime is 15421430681. The next prime is 15421430729. The reversal of 15421430691 is 19603412451.

It is a happy number.

15421430691 is a `hidden beast` number, since 1 + 54 + 214 + 306 + 91 = 666.

It is not a de Polignac number, because 15421430691 - 2³⁰ = 14347688867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15421430621) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 856746141 + ... + 856746158.

It is an arithmetic number, because the mean of its divisors is an integer number (3712566650).

Almost surely, 2^15421430691 is an apocalyptic number.

15421430691 is a deficient number, since it is larger than the sum of its proper divisors (6853969209).

15421430691 is a wasteful number, since it uses less digits than its factorization.

15421430691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1713492305 (or 1713492302 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 15421430691 in words is "fifteen billion, four hundred twenty-one million, four hundred thirty thousand, six hundred ninety-one".