215402155501 has 8 divisors (see below), whose sum is σ = 231985908504. Its totient is φ = 198820453440.

The previous prime is 215402155487. The next prime is 215402155541. The reversal of 215402155501 is 105551204512.

It can be written as a sum of positive squares in 4 ways, for example, as 16945270276 + 198456885225 = 130174^2 + 445485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-215402155501 is a prime.

It is a super-2 number, since 2×215402155501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215402155541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291046 + ... + 717991.

It is an arithmetic number, because the mean of its divisors is an integer number (28998238563).

Almost surely, 2^215402155501 is an apocalyptic number.

It is an amenable number.

215402155501 is a deficient number, since it is larger than the sum of its proper divisors (16583753003).

215402155501 is a wasteful number, since it uses less digits than its factorization.

215402155501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025471.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 215402155501 in words is "two hundred fifteen billion, four hundred two million, one hundred fifty-five thousand, five hundred one".