155435215402 has 4 divisors (see below), whose sum is σ = 233152823106. Its totient is φ = 77717607700.

The previous prime is 155435215399. The next prime is 155435215427. The reversal of 155435215402 is 204512534551.

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

It can be written as a sum of positive squares in only one way, i.e., 95208656481 + 60226558921 = 308559^2 + 245411^2 .

It is a super-2 number, since 2×155435215402² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38858803849 + ... + 38858803852.

Almost surely, 2^155435215402 is an apocalyptic number.

155435215402 is a deficient number, since it is larger than the sum of its proper divisors (77717607704).

155435215402 is an equidigital number, since it uses as much as digits as its factorization.

155435215402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77717607703.

The product of its (nonzero) digits is 120000, while the sum is 37.

Adding to 155435215402 its reverse (204512534551), we get a palindrome (359947749953).

The spelling of 155435215402 in words is "one hundred fifty-five billion, four hundred thirty-five million, two hundred fifteen thousand, four hundred two".