161333870649 has 16 divisors (see below), whose sum is σ = 246546518400. Its totient is φ = 91926622080.

The previous prime is 161333870647. The next prime is 161333870657. The reversal of 161333870649 is 946078333161.

It is not a de Polignac number, because 161333870649 - 2¹ = 161333870647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161333870647) 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, 10999212 + ... + 11013869.

It is an arithmetic number, because the mean of its divisors is an integer number (15409157400).

Almost surely, 2^161333870649 is an apocalyptic number.

It is an amenable number.

161333870649 is a deficient number, since it is larger than the sum of its proper divisors (85212647751).

161333870649 is a wasteful number, since it uses less digits than its factorization.

161333870649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22013440.

The product of its (nonzero) digits is 1959552, while the sum is 51.

The spelling of 161333870649 in words is "one hundred sixty-one billion, three hundred thirty-three million, eight hundred seventy thousand, six hundred forty-nine".