1016661551 has 4 divisors (see below), whose sum is σ = 1031835672. Its totient is φ = 1001487432.

The previous prime is 1016661517. The next prime is 1016661587. The reversal of 1016661551 is 1551666101.

1016661551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1551666101 = 5297 ⋅292933.

It is a cyclic number.

It is not a de Polignac number, because 1016661551 - 2¹⁴ = 1016645167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1016660551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7586960 + ... + 7587093.

It is an arithmetic number, because the mean of its divisors is an integer number (257958918).

Almost surely, 2^1016661551 is an apocalyptic number.

1016661551 is a deficient number, since it is larger than the sum of its proper divisors (15174121).

1016661551 is an equidigital number, since it uses as much as digits as its factorization.

1016661551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15174120.

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 1016661551 is about 31885.1305626933. The cubic root of 1016661551 is about 1005.5232874632.

It can be divided in two parts, 10166 and 61551, that added together give a palindrome (71717).

The spelling of 1016661551 in words is "one billion, sixteen million, six hundred sixty-one thousand, five hundred fifty-one".