161503677551 has 4 divisors (see below), whose sum is σ = 162587595000. Its totient is φ = 160419760104.

The previous prime is 161503677539. The next prime is 161503677611. The reversal of 161503677551 is 155776305161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161503677551 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161503677496 and 161503677505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161503677451) 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, 541958501 + ... + 541958798.

It is an arithmetic number, because the mean of its divisors is an integer number (40646898750).

Almost surely, 2^161503677551 is an apocalyptic number.

161503677551 is a deficient number, since it is larger than the sum of its proper divisors (1083917449).

161503677551 is a wasteful number, since it uses less digits than its factorization.

161503677551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083917448.

The product of its (nonzero) digits is 661500, while the sum is 47.

The spelling of 161503677551 in words is "one hundred sixty-one billion, five hundred three million, six hundred seventy-seven thousand, five hundred fifty-one".