16400620551 has 16 divisors (see below), whose sum is σ = 25025821184. Its totient is φ = 9358883424.

The previous prime is 16400620549. The next prime is 16400620573. The reversal of 16400620551 is 15502600461.

16400620551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16400620551 - 2¹ = 16400620549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16400620541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521860 + ... + 552393.

It is an arithmetic number, because the mean of its divisors is an integer number (1564113824).

Almost surely, 2^16400620551 is an apocalyptic number.

16400620551 is a deficient number, since it is larger than the sum of its proper divisors (8625200633).

16400620551 is a wasteful number, since it uses less digits than its factorization.

16400620551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074990.

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 16400620551 in words is "sixteen billion, four hundred million, six hundred twenty thousand, five hundred fifty-one".