85409478002 has 16 divisors (see below), whose sum is σ = 128505447000. Its totient is φ = 42574375680.

The previous prime is 85409477983. The next prime is 85409478023. The reversal of 85409478002 is 20087490458.

It is a happy number.

It is a Cunningham number, because it is equal to 292249²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 62689643641 + 22719834361 = 250379^2 + 150731^2 .

It is a super-3 number, since 3×85409478002³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5834252 + ... + 5848872.

Almost surely, 2^85409478002 is an apocalyptic number.

85409478002 is a deficient number, since it is larger than the sum of its proper divisors (43095968998).

85409478002 is a wasteful number, since it uses less digits than its factorization.

85409478002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23341.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 85409478002 in words is "eighty-five billion, four hundred nine million, four hundred seventy-eight thousand, two".