1661161754154 has 64 divisors (see below), whose sum is σ = 3843155828736. Its totient is φ = 468842205504.

The previous prime is 1661161754107. The next prime is 1661161754159. The reversal of 1661161754154 is 4514571611661.

It is not an unprimeable number, because it can be changed into a prime (1661161754159) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34441984 + ... + 34490180.

It is an arithmetic number, because the mean of its divisors is an integer number (60049309824).

Almost surely, 2^{1661161754154} is an apocalyptic number.

1661161754154 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1661161754154 is an abundant number, since it is smaller than the sum of its proper divisors (2181994074582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1661161754154 is a wasteful number, since it uses less digits than its factorization.

1661161754154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58179.

The product of its digits is 604800, while the sum is 48.

The spelling of 1661161754154 in words is "one trillion, six hundred sixty-one billion, one hundred sixty-one million, seven hundred fifty-four thousand, one hundred fifty-four".