1661151151 has 16 divisors (see below), whose sum is σ = 1883068416. Its totient is φ = 1451700000.

The previous prime is 1661151119. The next prime is 1661151157. The reversal of 1661151151 is 1511511661.

It is a cyclic number.

It is not a de Polignac number, because 1661151151 - 2⁵ = 1661151119 is a prime.

It is a Duffinian number.

1661151151 is a modest number, since divided by 151151 gives 1661 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661151157) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35361 + ... + 67621.

It is an arithmetic number, because the mean of its divisors is an integer number (117691776).

Almost surely, 2^1661151151 is an apocalyptic number.

1661151151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1661151151 is a deficient number, since it is larger than the sum of its proper divisors (221917265).

1661151151 is a wasteful number, since it uses less digits than its factorization.

1661151151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32454.

The product of its digits is 900, while the sum is 28.

The square root of 1661151151 is about 40757.2220716771. Note that the first 3 decimals coincide. The cubic root of 1661151151 is about 1184.3217827361.

The spelling of 1661151151 in words is "one billion, six hundred sixty-one million, one hundred fifty-one thousand, one hundred fifty-one".