16121201551 has 32 divisors (see below), whose sum is σ = 20003045888. Its totient is φ = 12651707520.

The previous prime is 16121201531. The next prime is 16121201563. The reversal of 16121201551 is 15510212161.

It is a cyclic number.

It is not a de Polignac number, because 16121201551 - 2⁵ = 16121201519 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16121201531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11672881 + ... + 11674261.

It is an arithmetic number, because the mean of its divisors is an integer number (625095184).

Almost surely, 2^16121201551 is an apocalyptic number.

16121201551 is a deficient number, since it is larger than the sum of its proper divisors (3881844337).

16121201551 is a wasteful number, since it uses less digits than its factorization.

16121201551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2351.

The product of its (nonzero) digits is 600, while the sum is 25.

The spelling of 16121201551 in words is "sixteen billion, one hundred twenty-one million, two hundred one thousand, five hundred fifty-one".